7. The computer system of claim 6, wherein said others of said plurality of tiles each has a left edge and a right edge located at distances d1 and d2 from said

7. The computer system of claim 6, wherein said others of said plurality of tiles each has a left edge and a right edge located at distances d1 and d2 from said cursor, and is moved to a position such that said left edge has a distance d1 from said cursor and said right edge has a distance d2′ from said cursor wherein: d 1 ′=S×sine(π÷2×d 1 ÷W) d 2 ′=S×sine(π÷2×d 2 ÷W). 8. The computer system of claim 7, wherein said at least one of said plurality of tiles is scaled by a factor of: 1+(d2′−d1′)÷(d2−d1). This is... not an invention.